I have a 36 inch diameter DR 17 HDPE pipe that is 15,300 meters long (yes 15.3 km) and it is approximately 80% buried. Line is treated effluent at 98 degrees F. The buried pipe modeler puts in "soil restraints" as required. The model ends up with 5000 plus non-linear restraints and the solver just can't seem to converge. Should I chop my model up into smaller segments. Chop locations at virtual anchors.

Regards,

Pat LaPointe P. Eng.